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  Colony formation in Scenedesmus: grazer-mediated release and chemical features of the infochemical.

Elert, E. v., & Franck, A. (1999). Colony formation in Scenedesmus: grazer-mediated release and chemical features of the infochemical. Journal of Plankton Research, 21(4), 789-804.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-000F-E0AE-6 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-000F-E0AF-4
Genre: Journal Article

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von Elert, E, A. Frank, 1999, S-37409.pdf (Publisher version), 206KB
 
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von Elert, E, A. Frank, 1999, S-37409.pdf
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 Creators:
Elert, Eric von1, Author           
Franck, Achim1, Author           
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1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              

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 Abstract: In the unicellularly growing green alga Scenedesmus acutus, the formation of many-celled coenobia may be induced by an infochemical released by the grazer Daphnia magna. We used a standardized bioassay to obtain information about the release of the infochemical by actively feeding D.magna and its chemical nature. The infochemical could not be extracted from the alga or the grazer by aqueous or more lipophilic solvents. When the release of coenobia-inducing activity by actively feeding D.magna was investigated as a function of the individual's body mass, no increase with increasing individual body mass was observed, indicating that the chemical cue originates from zooplankton's non-digestive metabolism rather than from digestion of alga by the grazer. The infochemical released by D.magna can be characterized as an olefinic low-molecular-weight carboxylic acid. Hydroxy and amino groups can be excluded as moieties of the infochemical essential for biological activity. We present a method to concentrate the infochemical from Daphnia incubation water using lipophilic solid-phase extraction. Subsequent separation by reversed-phase HPLC yielded only one active fraction.

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Language(s): eng - English
 Dates: 1999-04
 Publication Status: Issued
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 Identifiers: eDoc: 119817
Other: 1764/S 37409
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Title: Journal of Plankton Research
Source Genre: Journal
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Pages: - Volume / Issue: 21 (4) Sequence Number: - Start / End Page: 789 - 804 Identifier: ISSN: 0142-7873